<html><head>
<title>curl_multi_fdset man page</title>
<meta name="generator" content="roffit 0.7">
<STYLE type="text/css">
P.level0 {
 padding-left: 2em;
}

P.level1 {
 padding-left: 4em;
}

P.level2 {
 padding-left: 6em;
}

span.emphasis {
 font-style: italic;
}

span.bold {
 font-weight: bold;
}

span.manpage {
 font-weight: bold;
}

h2.nroffsh {
 background-color: #e0e0e0;
}

span.nroffip {
 font-weight: bold;
 font-size: 120%;
 font-family: monospace;
}

p.roffit {
 text-align: center;
 font-size: 80%;
}
</STYLE>
</head><body>

<p class="level0"><a name="NAME"></a><h2 class="nroffsh">NAME</h2>
<p class="level0">curl_multi_fdset - extracts file descriptor information from a multi handle <a name="SYNOPSIS"></a><h2 class="nroffsh">SYNOPSIS</h2>
<p class="level0"><pre>
<p class="level0">#include &lt;curl/curl.h&gt;
 <p class="level0">CURLMcode curl_multi_fdset(CURLM *multi_handle,
 &nbsp;                          fd_set *read_fd_set,
 &nbsp;                          fd_set *write_fd_set,
 &nbsp;                          fd_set *exc_fd_set,
 &nbsp;                          int *max_fd);
 <p class="level0"></pre>
<a name="DESCRIPTION"></a><h2 class="nroffsh">DESCRIPTION</h2>
<p class="level0">This function extracts file descriptor information from a given multi_handle. libcurl returns its fd_set sets. The application can use these to select() on, but be sure to FD_ZERO them before calling this function as <a class="emphasis" href="./curl_multi_fdset.html">curl_multi_fdset(3)</a> only adds its own descriptors it doesn't zero or otherwise remove any other. The <a class="emphasis" href="./curl_multi_perform.html">curl_multi_perform(3)</a> function should be called as soon as one of them are ready to be read from or written to. 
<p class="level0">If no file descriptors are set by libcurl, <span Class="emphasis">max_fd</span> will contain -1 when this function returns. Otherwise it will contain the higher descriptor number libcurl set. 
<p class="level0">You should also be aware that when doing select(), you should consider using a rather small (single-digit number of seconds) timeout and call <span Class="emphasis">curl_multi_perform</span> regularly - even if no activity has been seen on the fd_sets - as otherwise libcurl-internal retries and timeouts may not work as you'd think and want. 
<p class="level0">Starting with libcurl 7.16.0, you should use <span Class="bold">curl_multi_timeout</span> to figure out how long to wait for action. <a name="RETURN"></a><h2 class="nroffsh">RETURN VALUE</h2>
<p class="level0">CURLMcode type, general libcurl multi interface error code. See <span Class="emphasis">libcurl-errors(3)</span> <a name="SEE"></a><h2 class="nroffsh">SEE ALSO</h2>
<p class="level0"><a class="manpage" href="./curl_multi_cleanup.html">curl_multi_cleanup (3)</a> <a class="manpage" href="./curl_multi_init.html"> curl_multi_init (3)</a> <span Class="manpage"> </span> <a class="manpage" href="./curl_multi_timeout.html">curl_multi_timeout (3) </a> <p class="roffit">
 This HTML page was made with <a href="http://daniel.haxx.se/projects/roffit/">roffit</a>.
</body></html>
